A spider lift has a transport width of less than 800 mm. The buyer needs it to pass through a 900 mm doorway and carry out maintenance inside a building.
The machine fits through the door. But once inside, there is not enough space to deploy its outriggers.
Transport width and outrigger footprint are different specifications. Passing through an entrance says nothing, by itself, about whether a tracked lift can establish its required support arrangement at the working position.
1. Real dimensions: 795 mm in transit, almost 3 metres in setup
The Hinowa Lightlift 20.10 MK3 gives a clear example:
| Manufacturer’s specification | Value |
|---|---|
| Maximum working height | 20.15 m |
| Maximum horizontal outreach | 9.70 m |
| Adjustable track width | 795–1,095 mm |
| Transport height | 1.99 m |
| Transport length | 5.01 m |
| Stabiliser footprint | 2,922 × 2,925 mm |
| Maximum platform capacity | 230 kg |
Source: Hinowa Lightlift 20.10 MK3 technical sheet (April 2023), which includes a plan-view stabiliser drawing.
The tracks can narrow to 795 mm, but the specified support layout occupies roughly 2.92 × 2.93 m.
In a room only 2.6 m wide, with no room for the legs to reach outside it, this stated setup arrangement will not fit even though the machine has already entered through the door.
That is not a design defect. Compact access and a wider, stable working footprint are functions of two different machine configurations.
2. Why do spider lifts spread their outriggers?
A spider lift generally travels on tracks and then establishes its working support through outriggers or stabilisers in the arrangement specified by the manufacturer.
When the boom extends to one side, the boom, platform, people and materials create an overturning moment. The outrigger layout gives the machine a defined support geometry and transfers forces into the ground at its support points.
Does a wider outrigger stance always mean a safer machine? Not by itself. Stability also depends on structure, counterweight, boom position, platform load, support reactions and ground conditions.
Some machines offer alternative stabiliser arrangements that alter the permitted working envelope. Never assume the legs may simply be stopped short of their specified positions to fit a smaller room. Confirm the approved configuration and corresponding limits.
3. The final footprint is not the whole space requirement
Can the legs move into position?
The manufacturer’s footprint drawing shows a deployed arrangement. A nearby wall, column, handrail or fixed machine may interfere with the deployment path even when the final foot positions appear clear on a sketch.
Check how the stabilisers actually move, not only where they end up.
Is the ground suitable at all support points?
Spider lifts often work in courtyards, landscaped areas and other places where the bearing surface is not uniform. One outrigger may land on a paving slab over drainage, another on compacted fill.
Stabilising the machine concentrates forces at these support points. IPAF’s ground-condition guidance addresses variable-position outriggers, pad selection and the need to assess what lies beneath the surface.
A foot that can reach the ground has not necessarily reached ground capable of supporting it.
Can the boom reach the job without obstruction?
Even with the outriggers deployed, the boom may be restricted by its working envelope, load ratings and surrounding structures. A lift may be able to set up but still be unable to move its platform around a beam or reach the intended workface.
Transport dimensions govern access. The stabiliser footprint governs setup. The working envelope governs reach. All three must fit the job.
4. Travel slope and stabilisation angle mean different things
A tracked lift’s data sheet may list both a maximum travel slope and a maximum stabilisation angle.
Hinowa’s Lightlift 20.10 MK3 product information, for example, identifies a maximum travel slope of 16° and a stabilisation angle of 15° under its stated conditions. See the manufacturer’s product information.
These are not interchangeable permissions. A travel-slope rating does not authorise elevated work on that slope. Nor does a stabilisation-angle figure mean the machine can be set up on every slope of that nominal angle without checking individual leg positions, strokes, support conditions and the manual’s constraints.
5. Measure the site before ordering
| Site measurement | Question to answer |
|---|---|
| Clear entrance width and height | Will the machine pass in its specified transport configuration? |
| Route and turning space | Can it reach the work area, not just the doorway? |
| Final working area | Can the authorised stabiliser arrangement deploy fully? |
| Every outrigger landing point | Is the ground or structure capable of taking the relevant reaction? |
| Slope and elevation differences | Can the machine establish its prescribed level and support condition? |
| Overhead and surrounding obstacles | Can the platform follow a permitted route to the work point? |
A simple dimensioned plan is useful: mark the entrance, access route, intended setup position, nearby obstacles and work target. Compare it with the exact model’s transport drawing, outrigger plan view and working-envelope chart.
See the guide to ground pressure and wheel loads for the relevant checks.
Supplier request:
These checks belong before payment, not after an imported machine reaches a site where it cannot be deployed.
A spider lift is narrow to get into difficult places. It still needs space—and suitable ground—to establish its working support.